P3d and xplane can not born in same airport by using 1.4.33, the two planes looks between 8365.93nm. But the two plane can be together by using vatsim.So ,how to correct this issue?Thank you very much!

Can you try selecting the aircraft in the list, right-click and select Follow to see where you end up. Use a map tool or the simulator's map to see where it places you and where it is placing the other aircraft.